If you're buying for the silver value, not very much. If you're a coin collector looking for specific dates, it's up to you.

Everyone's approach differs. You do you. My personal practice has been buying 10 oz silver bars. Kind of a sweet spot for silver weight, lower premiums that I could afford on my budget. I buy them from an assortment of reputable dealers because I don't trust counterfeiters. Constitutional junk silver is nice because the low value per coin is an impediment to counterfeiting. I like 1960s quarters and 1964 Kennedy's, not for the collector value but because there is so little wear you get max silver per coin.